Hydraulic and earth engineering – Earth treatment or control – Shoring – bracing – or cave-in prevention
Patent
1981-12-09
1984-06-12
Corbin, David H.
Hydraulic and earth engineering
Earth treatment or control
Shoring, bracing, or cave-in prevention
299 1, 405302, E21D 2312
Patent
active
044538464
ABSTRACT:
This invention provides mine equipment for sensing the advance of mobile equipment, particularly on longwall face conveyors the equipment comprises two mine roof supports provided with sensor means for sensing relative movement between the associated roof supports and an elongate bar component secured to the conveyor and extending between the two supports in a direction rearwardly of the conveyor. The elongate component is magnetized so that a magnetic field is induced adjacent thereto, the induced magnetic field intensity varying longitudinally of the elongate component.
REFERENCES:
patent: 4089182 (1978-05-01), Takahashi et al.
patent: 4091627 (1978-05-01), Takahashi et al.
Brenkley David
Mullins Rex
Coal Industry (Patents) Limited
Corbin David H.
Wray James C.
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